<template>
    <div class="app-container">
        <el-form label-width="120px">
            <el-form-item label="讲师名称">
                <el-input v-model="teacher.name"/>
            </el-form-item>

            <el-form-item label="讲师排序">
                <el-input-number v-model="teacher.sort" controls-position="right"
            min="0"/>
            </el-form-item>

            <el-form-item label="讲师头衔">
                <el-select v-model="teacher.level" clearable placeholder="请选择">
                    <!--
                    数据类型一定要和取出的json中的一致，否则没法回填
                    因此，这里value使用动态绑定的值，保证其数据类型是number
                    -->
                    <el-option :value="1" label="高级讲师"/>
                    <el-option :value="2" label="首席讲师"/>
                </el-select>
            </el-form-item>

            <el-form-item label="讲师资历">
                <el-input v-model="teacher.career"/>
            </el-form-item>

            <el-form-item label="讲师简介">
                <el-input v-model="teacher.intro" :rows="10" type="textarea"/>
            </el-form-item>

            <!-- 讲师头像：TODO -->
            <!-- 讲师头像 -->
            <el-form-item label="讲师头像">
                <!-- 头衔缩略图 -->
                <pan-thumb :image="teacher.avatar"/>
                <!-- 文件上传按钮 -->
                <el-button type="primary" icon="el-icon-upload" @click="imagecropperShow=true">更换头像</el-button>

                <!--
                v-show：是否显示上传组件
                :key：类似于id，如果一个页面多个图片上传控件，可以做区分
                :url：后台上传的url地址
                @close：关闭上传组件
                @crop-upload-success：上传成功后的回调 -->
                <image-cropper
                    v-show="imagecropperShow"
                    :width="300"
                    :height="300"
                    :key="imagecropperKey"
                    :url="BASE_API+'/eduoss/fileoss'"
                    field="file"
                    @close="close"
                    @crop-upload-success="cropSuccess"/>

            </el-form-item>
            <el-form-item>
                <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdate">保存</el-button>
            </el-form-item>

        </el-form>
    </div>
</template>
<script>
    import teacherApi from '@/api/edu/teacher'
    import ImageCropper from '@/components/ImageCropper'
    import PanThumb from '@/components/PanThumb'
    export default {
        components:{ImageCropper, PanThumb},
        data() {
            return {
                teacher:{
                    name:'',
                    sort:0,
                    level:1,
                    carrer:'',
                    intro:'',
                    avatar:''
                },
                //上传弹框的组件是否显示
                imagecropperShow:false,
                imagecropperKey:0,
                BASE_API:process.env.BASE_API,//获取dev.env.js的端口号
                saveBtnDisabled:false
            }
        },
        created() {//页面渲染之前执行
            console.log('created')
            this.init()
        },
        watch: {//监听
            $route(to, from) {//路由发生变化，就会执行
                console.log('watch $route')
                this.init()
            }
        },
        methods:{
            close() {
                this.imagecropperShow=false;
                this.imagecropperKey = this.imagecropperShow ^ 1;
            },
            //上传成功
            cropSuccess(data) {
                this.imagecropperShow=false;
                //上传之后的接口返回图片的地址，赋值给avatar
                this.teacher.avatar = data.url;
                this.imagecropperKey = this.imagecropperShow ^ 1;
            },
            init() {
                //判断路径是否有id值
                if (this.$route.params && this.$route.params.id) {
                    //从路径中获取id值
                    const id = this.$route.params.id
                    this.getInfo(id)
                } else {
                    this.teacher = {}
                }
            },
            //根据讲师id查询的方法
            getInfo(id) {
                teacherApi.getTeacherInfo(id)
                    .then(response => {
                        this.teacher = response.data.teacher
                    })
            },
            //修改讲师的方法
            updateTeacher() {
                teacherApi.updateTeacherInfo(this.teacher)
                    .then(response => {
                        //提示信息
                        this.$message({
                            type: 'success',
                            message: '修改成功!'
                        });
                        //回到列表页面
                        this.$router.push({path:'/teacher/table'})
                    })
            },
            //添加讲师的方法
            saveOrUpdate() {
                //判断是修改还是添加
                //根据Teacher里面有没有id
                if(!this.teacher.id) {
                    //添加
                    this.saveTeacher(); 
                } else {
                    this.updateTeacher();
                }
                
            },
            saveTeacher() {
                teacherApi.addTeacher(this.teacher)
                    .then(response => {
                        //提示信息
                        this.$message({
                            type: 'success',
                            message: '添加成功!'
                        });
                        //回到列表页面
                        this.$router.push({path:'/teacher/table'})
                    })
            }
        }
    }
</script>